Here's a breakdown:

* Genes: Units of heredity that determine specific traits.

* Alleles: Different versions of the same gene.

* Identical Alleles: When an individual has two copies of the same version of a gene, they are called homozygous for that trait.

For example, let's consider eye color:

* Gene: The gene responsible for eye color.

* Alleles: There are different alleles for eye color, such as brown, blue, green, etc.

* Identical Alleles (Homozygous): If someone has two copies of the blue eye color allele, they are homozygous for blue eyes.